Not bad for T-joints but when converting from 10mm metric dowels to standard dowels on board ends holes are drilled at an angle I bought a dowel for driving dowel holes in the Final fiber purchased It also takes a little time to set the depth to the 'right' depth for flush mounting on L-shaped joints (e.g., slide box, box). However, you can craft an attachment for quicker adjustment. I would definitely buy it again because I like how well it makes T-joints, but I recommend a different jig for drilling straight holes in the ends of the boards.